Continuous-wave off-axis and in-line terahertz digital holography with phase unwrapping and phase autofocusing

Huang, Haochong; Wang, Dayong; Rong, Lü; Panezai, Spozmai; Zhang, Donglei; Qiu, Peiyao; Gao, Hua; Zheng, Haokun; Zhang, Zheng

doi:10.1016/j.optcom.2018.06.011

Cited by 24 publications

(12 citation statements)

References 35 publications

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“…The epidermis and dermis skin tissues could be distinguished from the amplitude image, and the difference of the optical path length at different positions of the tissue could be obtained from the phase information. In 2018, Huang et al presented and investigated the off-axis CW TDH based on the 2.52 THz FIRL 100 and a Pyrocam III (240 × 240 pixels) detector to image an asparagus fern [68]. The autofocus algorithm was used to find the amplitude reconstruction distance of 51.52 mm, and the phase reconstruction distance was 52.29 mm.…”

Section: Cw Thz Digital Holographymentioning

confidence: 99%

Continuous-Wave THz Imaging for Biomedical Samples

et al. 2020

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In the past few decades, the applications of terahertz (THz) spectroscopy and imaging technology have seen significant developments in the fields of biology, medical diagnosis, food safety, and nondestructive testing. Label-free diagnosis of malignant tumours has been obtained and also achieved significant development in THz biomedical imaging. This review mainly presents the research status and prospects of several common continuous-wave (CW) THz medical imaging systems and applications of THz medical imaging in biological tissues. Here, we first introduce the properties of THz waves and how these properties play a role in biomedical imaging. Then, we analyse both the advantages and disadvantages of the CW THz imaging methods and the progress of these methods in THz biomedical imaging in recent ten years. Finally, we summarise the obstacles in the way of the application of THz bio-imaging application technology in clinical detection, which need to be investigated and overcome in the future.

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Section: Cw Thz Digital Holographymentioning

confidence: 99%

Continuous-Wave THz Imaging for Biomedical Samples

et al. 2020

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“…Chen et al developed a denoising method for THz in-line digital holographic reconstructions, based on a Markov chain Monte Carlo sampling [151]. Different auto-focusing algorithms and corrections were investigated by Huang et al [125,127] and applied to reconstruct a pair of objects at different distances from the detector [121].…”

Section: In-line Digital Holographymentioning

confidence: 99%

THz coherent lensless imaging

et al. 2019

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Imaging with THz radiation has proved an important tool for both fundamental science and industrial use. Here we review a class of THz imaging implementations, named coherent lensless imaging, that reconstruct the coherent response of arbitrary samples with a minimized experimental setup based only on a coherent source and a camera. After discussing the appropriate sources and detectors to perform them, we detail the fundamental principles and implementations of THz digital holography and phase retrieval. These techniques owe a lot to imaging with different wavelengths, yet innovative concepts are also being developed in the THz range and are ready to be applied in other spectral ranges. This makes our review useful for both the THz and imaging communities, and we hope it will foster their interaction.

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“…It has serious implications for imaging, especially computational imaging experiments. For example, in the terahertz Fresnel off-axis digital holography experiment [1], the uneven intensity distribution of the light source seriously affects the accuracy of phase measurement. In the terahertz diffraction tomography [2], the uneven intensity distribution of the light source affects the fidelity of imaging.…”

Section: Introductionmentioning

confidence: 99%

Terahertz spatial filter based on enhanced optical transmission in the subwavelength aperture

Zhang

Lin

et al. 2023

International Conference on Optical and Photonic Engineering (icOPEN 2022)

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Beam quality is a core issue in the field of terahertz full-field imaging. In this paper, we present a terahertz spatial filter consisting of two mounted ellipsoidal silicon lenses, which have the same eccentricity but unequal size, and an opening aperture on a thin gold layer between the lenses. At the frequency of 2.52 THz, the beam transmissivity and Gaussicity of the filtering system is investigated by simulation. COMSOL Multiphysics is used to conduct two-dimensional simulation experiments, aiming to find the appropriate aperture size and gold layer thickness, depending on the wavelength of incident light wave and numerical aperture of the ellipsoidal silicon lens. The filtering system is capable of filtering the non-Gaussian beam to a nearly fundamental Gaussian beam, and achieves a high transmissivity. In terahertz full-field imaging, the system can not only obtain an imaging beam wtih uniform intensity distribution, but also reduce the beam energy loss caused by multiple surfaces. Besides, the lens system is applicable for a wide terahertz frequency range if the wavelength dependent part is properly scaled.

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Continuous-wave off-axis and in-line terahertz digital holography with phase unwrapping and phase autofocusing

Cited by 24 publications

References 35 publications

Continuous-Wave THz Imaging for Biomedical Samples

Continuous-Wave THz Imaging for Biomedical Samples

THz coherent lensless imaging

Terahertz spatial filter based on enhanced optical transmission in the subwavelength aperture

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